Apache + Node.js + mod_proxy. How to route one domain to :3000 and another to :80

Problem: I need to host a Node-application and a php-application on the same server on different domains.

example.com should use port 80 as normal, but node-example.com should route to port 3000.

Routing ALL traffic from port 80 to 3000 works fine using mod_proxy, thusly:

<VirtualHost *:80>
    ServerAdmin info@node-example.com
    ServerName  node-example.com
    ServerAlias www.node-example.com

    ProxyRequests off

    <Proxy *>
            Order deny,allow
            Allow from all
    </Proxy>

    <Location />
            ProxyPass http://localhost:3000/
            ProxyPassReverse http://localhost:3000/
    </Location>

</VirtualHost>

This however makes both example.com and node-example.com to point to localhost:3000 and run the Node-app.

Is there a way to keep example.com to point to port 80?

It would also be okay for example.com/old-admin to point to port 80.