Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5624fa458fa1a8af859c1aa08ed0f27655effdbe51ea3b36d616817fb711c6a4' 
  AND token = 'Al/A7CUz9jTa4gPjd5boGXBv+dHfIIlCHl8cQFXN3XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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