SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df92a639f9d47b1fbe8a19e6d0ca9aac65ebf2052d3f47899cfa17b88ae4a92c' 
  AND token = '2dsyWcdnlhXrWZy8Hbqjz+PmOJw6gWjGM1ctZfVZIHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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