SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '038810b60f24cd514826397464ed1e85562c222a354d6728230d30da999674b1' 
  AND token = 'sJx9zRdVVijv7/V+OqI4uRu5+cmAsfNtGoOSnbFGjBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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