SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10b515b64f6dd77ab45d7f72dca6d892a4b8b7eb4b958dfa4557dd637984d29c' 
  AND token = 'rwIahgqfWbAFGyd/MLIX73hlB2BWFBTXJfjJc3ysxpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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