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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a415d66e001f5a7f9e2c72ade66cf814a67fe49bc6a554dbc33fc1569e8f4cfb' 
  AND token = 'Dx6dMay2vktr10akesuYFp7ruJW8ZIUNccYudeGQA9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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