SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08059920dd0f005a88ee3ffb9e46830119469265e7e21e0658e53073d9c8d475' 
  AND token = 'BuowyfA81bvH8p/b+oluzWV7LR2oeaMGXSnsgnCoGwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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