SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '110b06abb8a481e50f7c6c70934785bf86f0667e529e59356bf4f7179584b1cd' 
  AND token = 'XiTzEYBLJK2OATMJcvZRZCjJqLOVNr3/otwwkRT+aEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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