SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9633ee3886fa2f49c013d2f5f3b91b4bb629b85193caba5ac41cdd4da59c30f5' 
  AND token = 'kZwgAFSSZawmXtg2OtYheAv/TMyLi7jFWOvo8wgpyqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}