How to filter our leads with Open Tasks due in the future?

Hi all!

Does anyone have experience filtering out leads with Open Tasks in salesforce, where the Task is due in the future? There is the "activity is logged" filter and you can filter for Due Date. But none of the options seem to let you filter out "has yet to occur", only things like date ranges or "yesterday" or "this month". 

I need to make sure any lead with an Open Task that isn't due yet is not contacted. Any idea how to do this without manually changing the filter all the time?

Thanks!

Deanna