SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3351f99767c29dde49c3272a949cee794115d21a4e1a80ca333d569c41644319' 
  AND token = '7WRVgPR6M8mvu44zGBHIFdyF6XKHws8az4+jFgpiO7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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