SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1d7e596f99ea1b14182dc84604cd1d930dbc526ae39a19ce77e9d1313a952de' 
  AND token = 'BGMP11KJ/fW8al84/mZ7CmmqthU7fVA+vio26CQjhrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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