SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67583506213039323a429c7ac8ab67c9286ed0812eba89d8d28effda298bc790' 
  AND token = 'WTtEQKCHhCzcwOq7meRtQhwZ6rP6jKX7dtzrGYVyZPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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