Hi OP, realise not what you're asking, sorry :)
But I am also time-poor and this is the healthy (ish) lunch box routine that works for us:
Plain yoghurt in re-fillable squeezy pouch (amazon)
Mini babybel or similar cheese
Apple or banana or grapes
Packet of oatcakes
Small portion of hummus or guacamole for dipping
Either carrot sticks or celery sticks or mini tomatoes
Optional raisins if it all looks a bit sparse
Other options we don't use but that I see other kids eating:
mini quiches, mini sausage rolls, chicken skewers, leftover pasta, etc.
Apart from chopping a carrot/celery once or twice a week, and washing the fruit, there is no prep.
I decant some yoghurt and a dip, and grab everything else and shove in the bag.
It can be done the night before but honestly takes under 3 mins so I just do in the morning. MUCH better than the options provided by school.