SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '599b366f27ba4ab2f72165ff980e2defe3361db4894603809f3aebe0680f5451' 
  AND token = '+62PiHGVhYUwMxASdKRnXfvza6zoO0B1354XEKg/M+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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