I'd say warded as well, yale did make wafer padlocks but they don't look like that... can't see anything in the keyway either, and you can always see at least the first wafer. That keyway plate should rotate freely about 90 degrees then stop, if so then it's definitely a warded mechanism. Bend a relatively thick bit of wire to an L shape about the same width as the keyway and put it to the back of the lock, rotating to feel for any kind of spring resistance. If you can't feel anything, flip it round and try it that way. Should be simple enough.
Edit: Just searched "yale warded padlock" on google and your exact lock came up, so that's that confirmed. Just noticed you said you wanna make a key for it, in that case instead of simply picking it what you could do is get a flat piece of steel (same width as the keyway) and impression it. You should find info on impressioning warded locks easily enough, if you blacken the steel with heat you should get pretty good marks. Much faster and easier than impressioning a pin tumbler.