SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c1fd525e89749b9cabf3a8b1e01d6d75ff09520da83787be20e3289a9a99d67' 
  AND token = 'gw0vx514ymJm5a5PXZpWvcILYErrzK5toGTXRDH/OXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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