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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b614b83cfe7c0015f9f316770fc886746473bc17a17efa9e8cdb4bc95b5f764a' 
  AND token = '9MwM5hlOUaokLf6YwKDUTxRSebqi94tSmNz9dGz7hWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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