SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4c814b6c440bdc9124cf56b9975754d8df0ad2aa713af6be3f682543a79de8f' 
  AND token = 'nYRL8WvZXpQtzS34eX5yHgNBMxsCWj99y0+gq3Re2W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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