SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36f224f0bf93b5b8e0c01a3b65d7091ab26c1e33fd24558427c7aadc556de2c9' 
  AND token = '1MtK2tbGUthZml/99WGG9mKrz+L1UklhPCjeqB3RuZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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