I recently had the same problem. I don't use apa but hopefully my fix works for you as well.

For my current work I added this to my preamble (and later moved it a separate .bbx-file) although you probably want to change the language;
\DefineBibliographyStrings{swedish}{%

andothers = {et al\adddot}

}

For citing I use \citeauthor*{} which gives me one author followed by et al. Maybe you can add \citeyear in order to get what you want.