SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0818722091c1bb751fcf8bc1b5bab7e2093a41f6459d156cd1f9af8fa5f7c8e7' 
  AND token = 'qxyhyOWlZLX1TFsiFch5FJ3ae9L/OkPwCDjxRxK/BJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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