SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20692f393f1b00f26c194751d0167c28bb5f8d0a8e3ec0bb4959e7d6284bdf8d' 
  AND token = 'evszXpfWVbwHe8TZGpLsqYSbcssBTxjEH0EjrZk5mV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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