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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a14dff862f2019d6beda8d0a76071534c84c044554b0f1523603037850bba33' 
  AND token = 'TXH21B1gaQEHB+NmnPqTfmjTM8umu40X0z1tL24h+7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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