SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e9e4d41948700691e571a5f7c466471d0d219bc1e78aa35fdaa62cf33203e38' 
  AND token = 'lkpykKv2/W4HjYb6GEdqMqcWkh5k+E1Vs54UZOrucvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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