You cannot take a mod_wsgi compiled for one Python version and forcibly point it at a virtual environment for another Python version. The mod_wsgi binary must be compiled for the specific Python version you want to use.
In other words, you cannot force a mod_wsgi compiled for Python 2.X, to use a virtual environment for Python 3.X.
So, if your mod_wsgi is for Python 2.X, remove it and install the variant of the package for Python 3, or compile it yourself from source code.