SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3052cf273fb3f305b76b4521cab2f0bf89fa9d47f8808d1cc7a695e1ae61a0a9' 
  AND token = 'OY8TvTJBCk4etYccvKky3sn0i62h7wxzCFPDqKZhDZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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