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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '997022529204ea48d6ee26c8c41153fbcd1c162428e61d5a29afaec91af8bd0a' 
  AND token = '5dIPrMPqr9tRm80mfA7aDINNQZ6pqKdfzTQzIXMdepU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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