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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40a8b43dc585dca97c3db13e28d627c8cfd05e31b0bad1fc6999ea4ee6283455' 
  AND token = 'QFIlp43jQ0YWCmdCBjZvUbM4AErg3iKrELQ46TsmQNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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