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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '481a97ba3cc4e23adb2c3a6026f682fff54690fa8dcfb81ff143a039cd59099f' 
  AND token = 'XSV+jsEbqzxNZiieOiRLX1r6bQbBoUCfLAqKpHr+q4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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