SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8a196fbdc266451433948abd5e98152c22ffd5d79c29075c2e3203d7dd30bf7' 
  AND token = 'RAnhWmuhbtFi6G7YBmUa6TGXoD2iN40r7JlJVkA2/eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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