SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d0764945a1c5e19ad180ac294956353fceb1e274215ff294bd99b94651fab9f' 
  AND token = 'sU7GgrAG5UzFjEEJ/ywbyhU7xgyeBS1WkJ5W1XfR3zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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