SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97ff090ad269c3ca863ccc560ca7f3ac0e1def7349fe0c5b2f282ce2d4ae1d15' 
  AND token = 'KUsgVFFy4JTOduqBQYSrB1LbZe6Xid9wOi8avinNP/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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