You can download unofficial windows binaries for your python version using https://www.lfd.uci.edu/~gohlke/pythonlibs/#mysqlclient. Then install it using pip. This way you’ll be able to avoid the hassle of dealing with visual studio build tools.
Just download the mysqlclient.whl file most applicable to you. I think in your case it’ll be
mysqlclient‑1.3.13‑cp36‑cp36m‑win_amd64.whl
and run
pip install "path to the downloaded .whl file"