SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1741ca7e123788c0df6ef18b4e5a19fa181f8fc6067b84415385be953b3bc0dd' 
  AND token = 'WHwD/zAXs4lbL7+Fd/N9TDzHvNwTtKMNh+IGd5BDWHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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