SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '527a7912b6b73f6630f208c6f2cbf241630c74978b26f1021a6f6911811987c9' 
  AND token = 'TJrpsTBqARiLVyiKJQ+rqx+T3CkxVUNMvw41PzDHgv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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