SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a558405772cf2f6be3b3698b70881a7ae3ed34fb958e1f43466a21f21fb3ea47' 
  AND token = 'A6w2p5tzNYsDBg2HauKdm/QzXlAd31QdP8zxF+iw/Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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