SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8d90845fa81d10c956f1c2cbfbb854328471a55261b77054a245db458a0a1b9' 
  AND token = 'gbBPRFMwyRHPZP2O1WK6S76HgJ3XQZXlfjqhlVk2Q5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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