The real risk isn't that they'll think you're overqualified - it's that *you* won't actually want the job once you're in it. So flip the frame first. Before you apply, get brutally honest about whether this role genuinely interests you or if you're just desperate to work there. If it's the latter, that'll show in interviews and they'll sense it. If it's the former, lead with that.
Here's the practical move: in your cover letter, briefly acknowledge the gap but frame it as intentional. "I'm at a point where I'm looking for roles that let me focus on X aspect of the work" or "I'm drawn to your company's approach to Y, and this role is where I can contribute meaningfully to that." Then in the interview, ask substantive questions about the actual work and the team - show you've thought through what you'd be doing day-to-day. Hiring managers respect someone who's made a deliberate choice, even a lateral one, way more than someone who looks like they're settling.
One thing I'd add that most people skip: dig into whether there's room to grow into something bigger within the first year or two. You can ask about that directly. "What does success look like in this role, and where do people typically go from here?" It signals you're thinking long-term about the company, not just trying to squeeze in the door.