SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b22615408ae6a6f3790ce51067ba38bcc84724e6675effaf9c88f28d1c79ae70' 
  AND token = '4pdjLYmYYznqZQ7ZljQ0D1pYmMKiTHXcvUnU4wc7Xpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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