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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4828dffb3fc948de80ecdf41be94e62e549778ebd66530c88c847a79e8a4ff12' 
  AND token = 'l7dH4ZBo5STF9cZxQjsD5QR+RLvP7iKZ4UReiw2ee/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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