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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6464abe43ffca6a33c3b581349aa16eb2ae8aa8dd93f434d484870fc4e4dfc66' 
  AND token = 'MtKnhgNH9b9slav4Z5BuRXS88iyezClblkNnA6kPQ3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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