SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d55f8eb02476fcb599c61ef28daeb13c80d0b12152ca58a2a72135c1deec348' 
  AND token = 'ywveBYufpcWNZYT+WhWZzJx8QUvNo9Go3rmC4wiLqb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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