SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57ca81185462ab1fd73ff03ba898cf74a6688f3685a75f4133dd11d868541e3a' 
  AND token = 'pUdQiX0C08GBnx/JWUvOqUcZ2owTDUODVh+v4EqybXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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