SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c89e2ef3c4dff8e7548baa478403211367a63a5795b5d90a9717e58d9b800e3' 
  AND token = 'wCwVffD4OsZOeRya6kKVULt3Gv6YYIIPBoWZGyEfrDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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