SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '824e3feb482f42e453c762fa857863aa5993059e13d4c2af641d4b5b5e099f3b' 
  AND token = 'H8ChyZL1HZNjUhpF7bRdAiZgGoq65eB/CiOJYlNmdmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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