Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee9421c25251f103e4f4cc0ecd1f45ec1d856a2a36b42155c4f53f9ab28b5017' 
  AND token = 'eoeoWr1ocGg/3nCw49CX0sVOyz+8EvaNm8jUX5oT/ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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