SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ceb495d694d88e036b2211105f95b99b629237f5f413ff1297c9035810bfe942' 
  AND token = 'KiciPcZD0JGFuwzdp7jrYYOn9CEn74p+Vy1/VNWV9SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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