SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4590502b00f92447cd96fee73d642b8da6d7591cc8e899a0e1f733f68ec9528b' 
  AND token = 'xjbj4vYb/eAu0Mkzp22v7E7ZJw3mzTrLqKSMg7aPIck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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