Hi,
Unfortunately I haven't heard of somebody temporally disabling the laptop keyboard. I've checked other support sites and forums and here are some troubleshooting steps that may help.
- First is to try disable the keyboard in Device Manager.
- In Device Manager expand Keyboard then right click on the keyboard driver and see if you have a disable option.
- If there's none the only way would be to disconnect the ribbon cable that connects the keyboard to the motherboard which is not a temporary fix unfortunately.
Here's another thread about that concern.
http://www.tomsguide.com/answers/id-2590043/disable-laptop-keyboard-external-keyboard-usb.html