How important is the keyword section in a paper
The number of keywords you should use depends on the journal you will submit your paper to. They usually require 3 to 5 keywords so they can direct the paper to relevant reviewers and editor. 

It also makes it easier to get recognition since search engines utilizes keywords instead of scanning whole papers. 

In short: No, you definitely should not ignore it. You should write down related keywords but do not exceed the number of journal.

Additionally each journal has a "Author's Guideline" documentation. If a submission fails to meet these guidelines, your paper is most likely to be rejected even before evaluation.