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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35ec053b69362b06b140c7355a2bc82d110e77c53b1395e02e57f5d5a40623d3' 
  AND token = 'BcceU3bPIjC6N64JEDfDJ7z8j38LoIBvRxtHMliivew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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