SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a35ab56e7fb024f098f957d0d577990baafcdc9b5c7073828829aa829a896163' 
  AND token = 'sr3FY3f4nGs2SN6MyWU0PTusUQlzXCCZvFKptAXqpvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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