SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '087d9eb89aed20bf41e159f5df774ab792096cbd2024d9c3c27e4035bee956c7' 
  AND token = 'ahz86EVYDGE7Jhg0qj6vhFwyb3aNRQZ2KP7CoUwV4/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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