SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b26dccf27c886f586190224206141ab19f3e91181ab9493032c2a55194d80fb7' 
  AND token = '9f0i4LNXYKAzN+PGHmZ92/6TwTZpia5sp6W51OMCJR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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