SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a7059e4c5192eee1d882e8c3143b93096717cb880e81aaa6e4f5cb052c06c61' 
  AND token = 'hi5OCflwqmKjvrLCS8wmFwAtSOZ5XBZi+PKPAjtzRyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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