SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95559b6d36b3e657618f4d53678914b2d37361d45b1c6b47cf0d774c8668abb3' 
  AND token = 'Z4B8/eJAbXqEiBxIQxvgFyEsypsim9r9Q0w6hqKvz8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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