Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '390877290956f65013a96fe9aa532bc899db2644934d703cd446b0de56bc4170' 
  AND token = '6AS6cfqBLa4WZAwSXMuqd0Xl6+6IcwktCWIRKl0fe2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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