SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94a7cff4c79527119367c86aeb0530f2d605b8fa749f869ad8b8c0309b55a7b6' 
  AND token = 'DITnvKz34qaSw0UmTA5r+BZSTlH4vtTRVKU5sUBw4iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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