SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6fd75b3c9a88ea0c1f5c32f9dc0ebb7557069272d7f1f6525f40833a43c936b' 
  AND token = 'aBjkJHO4vfT9XBRTPkKe9c1bDut9qj6/RaVGOnQoVA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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