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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c896d11bed7e61decc409c159e7587990811dbe6ae83b0991409328fbc4980a6' 
  AND token = 'NPxK1bfMe8ZtUhIrorc//P39PnRz4J4MpdmEuf+mslY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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