GeoDjango: Finding objects in radius

I'm currently trying to get a list of points contained within a radius but I can't get it working. Here is the code of my view so far:

from django.contrib.gis.geos import Point
from django.contrib.gis.measure import Distance

class AreaInfoViewSet(viewsets.ViewSet):
    queryset = models.AreaInfoRequest.objects.all()
    serializer_class = serializers.AreaInfoRequestRequestSerializer

    def list(self, request):
        center_point = 'POINT(48.80033 2.49175)'
        radius = "50.0"

        data = {"center_point": center_point, "radius": radius, "source_ip": utils.get_client_ip(request)}
        serializer = serializers.AreaInfoRequestRequestSerializer(data=data)
        serializer.is_valid(raise_exception=True)
        serializer.save()

        # Contains an object with field "from_location"="SRID=4326;POINT (48.80029 2.49157)"
        objs = models.PointsResult.objects.all()

        float_radius = serializer.data["radius"]
        center_point = serializer.data["center_point"] # Point object

        res = models.PointsResult.objects.filter(from_location__distance_lte=(
            center_point, Distance({"meter": float_radius})))
        # Here the res doesn't contain the unique object in the db even if it's within the radius

        return Response(res)

Any idea why it's not working? Thank you

from GeoDjango: Finding objects in radius