Just disconnect your ignition lock cylinder from your harness and you will have spark.
when the key is in the "off" position it grounds out the ignition system so if you unplug it then it should start given that all the other components are working proper. I had 3 of these mopeds (now 2) and one didn't have a key. if you do this the engine will run but your lights wont work. just hope your kill switch by the throttle works. be the only way to kill the engine unless you want to grab onto the spark plug boot while its running lol and i don't recommend that