SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '440409c2d567e4920955d71f368bc8671b98e7f5fe56b9b3384960f35d193245' 
  AND token = 'P0tl51VVZy67MXYAMWxQOfp9ORaj+w9vsUeJAfgAano=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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