SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd8913ba12d2341b71216fa42caca524e6a73ee292717debbedeb71a8d0f8107' 
  AND token = 'mhPVZGKxAVc5itUxs7wjzu9qtWTttmp0PvVE9/Z6GiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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