SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a803e158b7df71bc3db75d49b498105655bcf59e3d0b8c44c872e25ee226e212' 
  AND token = '4qcBFxUEdu/HsKzXm1uMPIr0qsCoe7Zc6dj3intBjfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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