SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '156fbb16efd3e73e05f22b94b8df40e4adefd7988f3c89b5c16e01e5a6f094f3' 
  AND token = 'h9NXLFGpsl7wCGRTA2wjsJOwBjE2nWtT296q9HdjGBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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