SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0148cc44e6e6c875ff5c0be24b06584fb1dfa9bb539e312ca573a18bc466bdf' 
  AND token = 'W3QZk+ZShNyh29A38hFiG/oXhnt0Zz4OVwm8BEE4QuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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