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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6a7d61a4d51c36891ecca668c555fb867ad6e3256ebd201524912963c89e8d0' 
  AND token = 'zQxBkUwa1LZgZT0pta5c+SYLCbGDhA798JYagR0heuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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