* Olaf Selke:
I'm just too lazy to renew the ssl certificate or to switch to letsencrypt [...]
It just has to be said: Creating a single-host Let's Encrypt cert is very easy on Debian Linux, which you seem to be using. Install Certbot, shutdown Apache, run Certbot, modify Apache's certificate path settings, start Apache. I'd offer to do it for you, but somehow I doubt you'll grant me root access to your server. ;-)
No pressure.
-Ralph