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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13e327f943286a55d7d662a9c40eb46e05343c4e2c16f5afa82b5e824e4a4476' 
  AND token = '5DAKagC0m+iVGr6v3o4hxyxsAUFM7tLIl7a8f7I5zT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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