You can set one audio track as a source and have a second similar one auto-align with it. Right-click the audio track in Kdenlive's timeline and you'll see these options.

The way I use it is:

1. Record video on a phone
2. At the same time, record superior audio on a microphone
3. In Kdenlive, load both project files and align the mic's audio track to the phone's inferior audio (which you first designate as the source)
4. Delete the phone audio and splice the remaining material

It's been incredibly helpful for me to the point of donating to the dev team.