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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6564cf55d357419dcc18453a40bb954d1d6284cbd5efe9675ecd3557405031a6' 
  AND token = 'WGBHg7ZTbCBOREpa8BswPpReSo+jAxwyBbViP5O1v9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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