SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '532c527bd46c40a4d4355752adaa9179c05bdcff0650c5afa6cb33eecf2e7260' 
  AND token = '8kBWZdltihBcvOsZDqsYVKV75wI/L+qe8MJGJi8EWsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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